Picosecond energy transfer and multiexciton transfer outpaces Auger recombination in binary CdSe nanoplatelet solids
Abstract
Fluorescence resonance energy transfer (FRET) enables photosynthetic light harvesting1, wavelength down-conversion in light-emitting diodes (LEDs)2, and optical bio-sensing schemes3. The rate and efficiency of this donor to acceptor transfer of excitation between chromophores dictates the utility of FRET and can unlock new device operation motifs including quantum-funnel solar cells4, non-contact chromophore pumping from a proximal LED5, and drastically reduced gain thresholds6. However, the fastest reported FRET time constants involving spherical quantum dots (QDs) (0.12-1 ns7-9), do not outpace biexciton Auger recombination (0.01-0.1 ns)10, which impedes multiexciton-driven applications including electrically-pumped lasers11 and carrier-multiplication-enhanced photovoltaics.12,13 Few-monolayer thick semiconductor nano-platelets (NPLs) with tens-of-nanometer diameters14 exhibit intense optical transitions14 and hundreds-of-picosecond Auger recombination15,16, but heretofore lack FRET characterizations. We examine binary CdSe NPL solids and show that inter-plate FRET (~6-23 ps, presumably for co-facial arrangements) can occur 15-50 times faster than Auger recombination15,16 and demonstrate multiexcitonic FRET, making such materials ideal candidates for advanced technologies.
- Authors:
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- National Science Foundation (NSF); USDOE Office of Science - Office of Basic Energy Sciences - Scientific User Facilities Division
- OSTI Identifier:
- 1392336
- DOE Contract Number:
- AC02-06CH11357
- Resource Type:
- Journal Article
- Journal Name:
- Nature Materials
- Additional Journal Information:
- Journal Volume: 14; Journal Issue: 5; Journal ID: ISSN 1476-1122
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Rowland, Clare E., Fedin, Igor, Zhang, Hui, Gray, Stephen K., Govorov, Alexander O., Talapin, Dmitri V., and Schaller, Richard D. Picosecond energy transfer and multiexciton transfer outpaces Auger recombination in binary CdSe nanoplatelet solids. United States: N. p., 2015.
Web. doi:10.1038/NMAT4231.
Rowland, Clare E., Fedin, Igor, Zhang, Hui, Gray, Stephen K., Govorov, Alexander O., Talapin, Dmitri V., & Schaller, Richard D. Picosecond energy transfer and multiexciton transfer outpaces Auger recombination in binary CdSe nanoplatelet solids. United States. https://doi.org/10.1038/NMAT4231
Rowland, Clare E., Fedin, Igor, Zhang, Hui, Gray, Stephen K., Govorov, Alexander O., Talapin, Dmitri V., and Schaller, Richard D. Mon .
"Picosecond energy transfer and multiexciton transfer outpaces Auger recombination in binary CdSe nanoplatelet solids". United States. https://doi.org/10.1038/NMAT4231.
@article{osti_1392336,
title = {Picosecond energy transfer and multiexciton transfer outpaces Auger recombination in binary CdSe nanoplatelet solids},
author = {Rowland, Clare E. and Fedin, Igor and Zhang, Hui and Gray, Stephen K. and Govorov, Alexander O. and Talapin, Dmitri V. and Schaller, Richard D.},
abstractNote = {Fluorescence resonance energy transfer (FRET) enables photosynthetic light harvesting1, wavelength down-conversion in light-emitting diodes (LEDs)2, and optical bio-sensing schemes3. The rate and efficiency of this donor to acceptor transfer of excitation between chromophores dictates the utility of FRET and can unlock new device operation motifs including quantum-funnel solar cells4, non-contact chromophore pumping from a proximal LED5, and drastically reduced gain thresholds6. However, the fastest reported FRET time constants involving spherical quantum dots (QDs) (0.12-1 ns7-9), do not outpace biexciton Auger recombination (0.01-0.1 ns)10, which impedes multiexciton-driven applications including electrically-pumped lasers11 and carrier-multiplication-enhanced photovoltaics.12,13 Few-monolayer thick semiconductor nano-platelets (NPLs) with tens-of-nanometer diameters14 exhibit intense optical transitions14 and hundreds-of-picosecond Auger recombination15,16, but heretofore lack FRET characterizations. We examine binary CdSe NPL solids and show that inter-plate FRET (~6-23 ps, presumably for co-facial arrangements) can occur 15-50 times faster than Auger recombination15,16 and demonstrate multiexcitonic FRET, making such materials ideal candidates for advanced technologies.},
doi = {10.1038/NMAT4231},
url = {https://www.osti.gov/biblio/1392336},
journal = {Nature Materials},
issn = {1476-1122},
number = 5,
volume = 14,
place = {United States},
year = {2015},
month = {3}
}
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